为什么ModelState.IsValid总是在mvc中返回false

Question

在我的控制器中这段代码:

[HttpPost]
        public ActionResult Edit(Company company, FormCollection IsCostCenters)
        {
            if (ModelState.IsValid)
            {
                Company objNewCompany = new Company();
                //oParty.CostCenters.Clear();

                using (PaymentAdviceEntityContainer db1 = new PaymentAdviceEntityContainer())
                {
                    objNewCompany = db1.Companies.Find(company.Id);

                    objNewCompany.CostCenters.Clear();

                    string[] temp = IsCostCenters["CostCenters"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
                    foreach (var s in temp)
                    {
                        if (s != "false")
                        {

                            CostCenter oCostCenter = new CostCenter();
                            oCostCenter = db1.CostCenters.Find(Convert.ToInt32(s));
                            objNewCompany.CostCenters.Add(oCostCenter);
                        }
                    }
                    db1.SaveChanges();
                }

                db.Entry(company).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            ViewBag.CreatedById = new SelectList(db.Employees, "Id", "FirstName", company.CreatedById);
            return View(company);
        }

我的观看代码如下

@using PaymentAdviceEntity;
@{

    ViewBag.Title = "Edit";
    List<CostCenter> clist = new List<CostCenter>();
    clist = ((List<CostCenter>)ViewBag.CostCenters).ToList();
}



                       <div style="line-height: 22px; width: 100%;height :3%; float: left; ">
                       @{
    foreach (var item in clist)
    {                      
                             <div  style="line-height: 22px; width: 28%; float: left;">
                                                <span class="checkbox">@Html.CheckBox("CostCenters", item.IsChecked, new { @value = item.Id })</span>
                                               <span>@Html.DisplayFor(modelItem => item.Name)</span>

                              </div> 

    }
}

那么请ModelState.IsValid在页面发布时间返回false是什么原因...

Answer 1

请发布您的模型类.

要检查模型状态中的错误,请使用以下代码

var errors = ModelState
    .Where(x => x.Value.Errors.Count > 0)
    .Select(x => new { x.Key, x.Value.Errors })
    .ToArray();

或者你也可以使用

var errors = ModelState.Values.SelectMany(v => v.Errors);

在上面一行放置一个断点,看看你的错误是什么ModelState.

Answer 2

正如布拉德威尔逊在其答案中所述:

ModelState.IsValid告诉您是否已将任何模型错误添加到ModelState.

默认模型绑定器将为基本类型转换问题添加一些错误(例如,为非"数字"传递非数字).您可以根据您使用的任何验证系统更完整地填充ModelState.

尝试使用: -

if (!ModelState.IsValid)
{
    var errors = ModelState.SelectMany(x => x.Value.Errors.Select(z => z.Exception));

    // Breakpoint, Log or examine the list with Exceptions.
}

如果它有助于抓住你的错误.礼貌和这个